How does wet-on-wet colour usually behave when the paper loses its shine and remains only damp?

Correct answer: It spreads less and forms a more controlled edge

The governing concept is moisture control in watercolour. A fully wet, shiny sheet lets pigment travel widely, but when the shine disappears and the paper is only damp, surface water is less mobile. Therefore the wash spreads less and its boundary becomes more manageable. Option A is correct; the colour does not vanish, change into oil paint, or normally tear the paper merely because the surface is damp.